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Lincoln LS random misfire

114 messages,  Last post on Jun 18, 2013 at 6:50 AM

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What is this discussion about? Lincoln LS, Engine, Sedan

Messages Page 7 of 12

#61 of 114 MAF diagnosis a year later? by lsv8girl

Aug 11, 2008 (3:28 pm)

How about this, guys? I know little about cars - just what guys at work talk about. My 2000 LS (V8) started off by not accelerating when getting on the highway, had the "computer" reprogrammed 2 or 3 times. The guys at work suggestedthe MAF sensor could be going, but I didn't mention it to the dealer, I figured it was their job to tell me the problem. It was ok a few months, then noticed a drag when accelerating from 40 to 45+ - basically at 42 mph regardless. Since I didn't really drive on the highway anymore, I decided to delay any further diagnostic until $ came in. Finally, the car stalled 2 mos ago at 43mph, and started after about 10 cranks with CEL. Dealer said 8th cyl misfire $450, brother-in-law (certified shop) said $350, so he fixed it. CEL again, shop changed fuel&air filters, & oil. Light comes back (lean exhaust codes) , dealer took air filter out, put theirs in, CEL driving off the lot. Took it in again today, now they say $1300, new MAF sensor and remaining 7 coils shot. No answer as to why those 7 were fine 2 mos ago! Any suggestions?

#62 of 114 Re: MAF diagnosis a year later? [lsv8girl] by jetstang

Aug 11, 2008 (8:48 pm)

Replying to: lsv8girl (Aug 11, 2008 3:28 pm)
You can buy the COPS on ebay for about $20 each, factory motorcraft pieces, not rip offs. I had a cop miss, and just replaced them all as I had a valve cover leak, after living with a miss for a month. I don't know how your coils could all go bad at the same time, but it probably needs them. You can replace the cops and plugs yourself with some basic hand tools and a little patience and save a ton of money. After that, have it rescanned if needed, then see about the rest of the repairs.

#63 of 114 HUMMING NOISE by martin57

Aug 18, 2008 (8:13 am)

HI, I GOT A 02 LINCOLN LS WITH THE 6 CYLINDER ENGINE, ABOUT 2 MONTH AGO IT STARTED MAKING A HUMMING OR WHINNING NOISE COMING FROM THE REAR SOME WHERE, IT ONLY DOES IT WHEN YOUR GOING A STEADY SPEED OR HAVE THE CRUISE SET, AS SOON AS YOU LET OFF ON THE GAS, STEP ON THE GAS, OR GO UP A STEP HILL IT GOES AWAY, IT STARTED ABOUT 4,000 MILES AGO AND ITS GETTING LOUDER THE MORE I DRIVE IT, ANY IDEAS WHAT IT MIGHT BE? MY DRIVE SHAFT AND WHEEL BEARINGS ALL FELT TIGHT OR DIDN'T HAVE ANY PLAY IN THEM THAT I COULD TELL. THANKS..

#64 of 114 Re: MAF diagnosis a year later? [lsv8girl] by wmman

Sep 18, 2008 (2:05 pm)

Replying to: lsv8girl (Aug 11, 2008 3:28 pm)
I had a similar problem, with a miss on one of the back cylinders. The dealership wanted $1400 to replace all 8 coil packs. The said once oil was gets on the coil packs form leaking valve cover gaskets, they would soon fail. I do not know if this 100% accurate. I decided to replace the all the valve cover gaskets (source of the oil getting on the coil packs) and all 8 packs myself. That was one year ago and no problems since. I have a friend who has replaced just one coil pack and did just fine.

#65 of 114 Re: MAF diagnosis a year later? [wmman] by rgnmstr

Nov 15, 2008 (1:58 pm)

Replying to: wmman (Sep 18, 2008 2:05 pm)
Does anyone have any experience buying coil packs off ebay?

#66 of 114 Re: random misfire [natesr70] by rgnmstr

Nov 15, 2008 (2:10 pm)

Replying to: natesr70 (Feb 28, 2008 11:57 am)
I have a 2002 V8 Sport w/ 115,000 miles. My valve cover gaskets were replaced at about 65,000 miles. I now have an intermetent missfire which seems to happen when in a higher gear and accelerating. Engine is smooth at idle and when accelerating normally up thru the gears. I'm guessing I have a COP problem. What I'd like to know is how much stuff has to be removed before you can take the center part of the valve covers off to do the COP replacement job. I long for the old days with points, rotor, condenser, and one $10 coil bolted to the front of the engine.

#67 of 114 Re: random misfire [rgnmstr] by brucelinc

Nov 17, 2008 (7:20 am)

Replying to: rgnmstr (Nov 15, 2008 2:10 pm)
The COP covers are not difficult to remove. The right (passenger) side is a 10 minute job. All you need is a 7mm socket with an extension. Quarter inch drive is best because it is smaller. An open end 7mm wrench is nice to have, too, especially on the driver's side.
 
The left side is tighter but you don't really need to remove anything. It is more a matter of loosening some things so you can move them a bit. The bracket on top of the strut tower can just be loosened so it will move out of the way. The dipstick tube will move aside slightly without taking it out. The cover on the left side will come out by pulling it forward and up. It looks more difficult than it is. The COPs are held in place with one screw and the electrical clip.
 
Compared to replacing the valve cover gaskets, removal of the COP covers is a piece of cake.

#68 of 114 Re: random misfire [brucelinc] by rgnmstr

Nov 17, 2008 (7:21 pm)

Replying to: brucelinc (Nov 17, 2008 7:20 am)
Thanks for the info but even if you can get the covers off without removing any other parts I don't see room to get my hands in there to work on the COPs.

#69 of 114 Re: random misfire [rgnmstr] by brucelinc

Nov 18, 2008 (8:32 am)

Replying to: rgnmstr (Nov 17, 2008 7:21 pm)
It is a bit tight. A few scapes and scratches are par for the course. Really, though, it isn't as bad as it looks. Once the covers are off and the coil connections are free, the coils pull up and out. The coil boots are 6-8 inches long but are flexible.
 
The first time I had a misfire, I had the dealer do a stress test and he found one bad coil. They participated in an After Warranty Adjustment on that one. Later I had another one go bad so I decided to change the remaining seven myself. I had already changed the plugs once so I knew what I was getting into but had no way to figure out which coil was actually the culprit. Eventually, they all seem to fail anyway.
 
An independent shop might not be too spendy. I don't know what the flat rate manual would say in terms of the time needed for labor but I doubt if it would be more that a couple of hours - just a guess.

#70 of 114 Re: random misfire [brucelinc] by rgnmstr

Dec 13, 2008 (12:40 am)

Replying to: brucelinc (Nov 18, 2008 8:32 am)
I would still like to find out if anyone have any experience purchasing COPs from online dealers selling on ebay? Are they seconds, Chinese, parts that didn't pass QE or are they just fine. Dealers on ebay are selling these things for $150 a set of 8. Parts stores in Maryland want $56. Ford dealers want $76 and independent repair shops want a wopping $96 each and that's when you have them do the job. Big difference between $150 a set and almost a grand a set. The name of one of the ebay dealers is World Autoparts. Thanks.

Messages Page 7 of 12

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